CP-23810: add (optional) inspector feature

[evan-cz]

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Description

The inspector is a small proxy server which sits in a container alongside of the CloudZero Agent to help surface connectivity errors between Prometheus and the CloudZero API in an actionable way.

The docker image for the inspector isn't currently published anywhere, so you'll have to do a make docker from that repo. Hopefully that will change soon, though when it does I'm guessing the name in this patch will need a tweak.

References

Include any links supporting this change such as a:

• GitHub Issue/PR number addressed or fixed
• StackOverflow post
• Support forum thread
• Related pull requests/issues from other repos

If there are no references, simply delete this section.

Testing

Thins is pretty simple to toggle on/off. Once you've created the docker image locally, just set enableInspector: true in your values and install the chart.

Checklist

• I have added documentation for new/changed functionality in this PR
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main